Threshold Filtering

Threshold filters, following the guidance of Florida Department of Environmental Protection’s (FDEP) Division of Environmental Assessment and Restoration (DEAR) are used to exclude specific results values from the SEACAR Analysis. Based on the threshold filters, Quality Assurance / Quality Control (QAQC) Flags are inserted into the SEACAR_QAQCFlagCode and SEACAR_QAQC_Description columns of the export data. The Include column indicates whether the QAQC Flag will also indicate that data are excluded from analysis. No data are excluded from the data export, but the analysis scripts can use the Include column to exclude data (1 to include, 0 to exclude).

Continuous Water Quality threshold values
Parameter Name Units Low Threshold High Threshold Sensor Type
Dissolved Oxygen mg/L 0 50 YSI EXOs
Dissolved Oxygen mg/L 0 50 Analysis Only - 2022-04-04
Dissolved Oxygen mg/L 0 50 6600 Series
Salinity ppt 0 70 6600 Series
Salinity ppt 0 70 YSI EXOs
Salinity ppt 0 70 Analysis Only - 2022-04-04
Water Temperature Degrees C -5 45 YSI EXOs
Water Temperature Degrees C -5 45 Analysis Only - 2022-04-04
Water Temperature Degrees C -5 45 6600 Series
pH pH 2 14 Analysis Only - 2022-04-04
pH pH 2 14 6600 Series
pH pH 2 14 YSI EXOs
Dissolved Oxygen Saturation % 0 500 YSI EXOs
Dissolved Oxygen Saturation % 0 500 6600 Series
Dissolved Oxygen Saturation % 0 500 Analysis Only - 2022-04-04
Specific Conductivity mS/cm 0 100 6600 Series
Specific Conductivity mS/cm 0 200 YSI EXOs
Turbidity NTU 0 4000 YSI EXOs
Turbidity NTU 0 1000 6600 Series
Turbidity NTU 0 4000 Analysis Only - 2022-04-04
Discrete Water Quality threshold values
Parameter Name Units Low Threshold High Threshold
Dissolved Oxygen mg/L 0.000001 22
Salinity ppt 0 70
Water Temperature Degrees C 3 40
pH 2 13
Dissolved Oxygen Saturation % 0.000001 310
Specific Conductivity mS/cm 0.005000001 100
Turbidity NTU 0 -
Total Suspended Solids (TSS) mg/L 0 -
Chlorophyll a uncorrected for pheophytin ug/L 0 -
Chlorophyll a corrected for pheophytin ug/L 0 -
Secchi Depth m 0.000001 50
Light Extinction Coefficient m^1 0 -
Colored dissolved organic matter, CDOM PCU 0 -
Fluorescent dissolved organic matter, FDOM QSE 0 -
Total Nitrogen mg/L 0 -
Total Kjeldahl Nitrogen TKN mg/L 0 -
NO2+3 Filtered mg/L 0 -
NH4 Filtered mg/L 0 -
Total Phosphorus mg/L 0 -
PO4 Filtered mg/L 0 -
Ammonia- Un-ionized (NH3) mg/L 0 -
Nitrate (N) mg/L 0 -
Nitrite (N) mg/L 0 -
Nitrogen, organic mg/L 0 -
Quality Assurance Flags inserted based on threshold checks listed in Table 1 & 2
SEACAR QAQC Description Include SEACAR QAQCFlagCode
Exceeds Maximum threshold. Not verified in raw data No 2Q
Exceeds Maximum threshold. Verified in raw data No 3Q
Below Minimum threshold. Not verified in raw data No 4Q
Below Minimum threshold. Verified in raw data No 5Q
Within threshold tolerance Yes 6Q
No defined thresholds for this parameter Yes 7Q

Value Qualifiers

Value qualifier codes included within the data are used to exclude certain results from the analysis. The data are retained in the data export files, but the analysis uses the Include column to filter the results.

STORET and WIN value qualifier codes

Value qualifier codes from STORET and WIN data are examined with the database and used to populate the Include column in data exports.

Value Qualifier codes excluded from analysis
Qualifier Source Value Qualifier Include MDL Description
STORET-WIN H No 0 Value based on field kit determination; results may not be accurate
STORET-WIN J No 0 Estimated value
STORET-WIN V No 0 Analyte was detected at or above method detection limit
STORET-WIN Y No 0

Discrete Water Quality Value Qualifiers

The following value qualifiers are highlighted in the Discrete Water Quality section of this report. An exception is made for Program 476 - Charlotte Harbor Estuaries Volunteer Water Quality Monitoring Network and data flagged with Value Qualifier H are included for this program only.

H - Value based on field kit determiniation; results may not be accurate. This code shall be used if a field screening test (e.g., field gas chromatograph data, immunoassay, or vendor-supplied field kit) was used to generate the value and the field kit or method has not been recognized by the Department as equivalent to laboratory methods.

I - The reported value is greater than or equal to the laboratory method detection limit but less than the laboratory practical quantitation limit.

Q - Sample held beyond the accepted holding time. This code shall be used if the value is derived from a sample that was prepared or analyzed after the approved holding time restrictions for sample preparation or analysis.

S - Secchi disk visible to bottom of waterbody. The value reported is the depth of the waterbody at the location of the Secchi disk measurement.

U - Indicates that the compound was analyzed for but not detected. This symbol shall be used to indicate that the specified component was not detected. The value associated with the qualifier shall be the laboratory method detection limit. Unless requested by the client, less than the method detection limit values shall not be reported

Systemwide Monitoring Program (SWMP) value qualifier codes

Value qualifier codes from the SWMP continuous program are examined with the database and used to populate the Include column in data exports. SWMP Qualifier Codes are indicated by QualifierSource=SWMP.

SWMP Value Qualifier codes
Qualifier Source Value Qualifier Include Description
SWMP -1 Yes Optional parameter not collected
SWMP -2 No Missing data
SWMP -3 No Data rejected due to QA/QC
SWMP -4 No Outside low sensor range
SWMP -5 No Outside high sensor range
SWMP 0 Yes Passed initial QA/QC checks
SWMP 1 No Suspect data
SWMP 2 Yes Reserved for future use
SWMP 3 Yes
SWMP 4 Yes Historical: Pre-auto QA/QC
SWMP 5 Yes Corrected data

Water Column

The water column habitat extends from the surface of all water bodies to the bottom sediments and encompasses the different features found in the water at different depths (National Oceanographic Center, 2016). The water column habitat must be viewed in relation to its interconnectedness with other habitats. A healthy water column is an integral component in ensuring a healthy marine and coastal ecosystem. Having a flourishing marine and coastal ecosystem in Florida is necessary to support a strong economy. The health of the water column is dependent upon factors as diverse as land use (e.g., agriculture, mining, forestry practices); human population growth; emissions, (e.g., power plants, automobiles, wastewater); climate (e.g., rainfall, temperature, winds and currents); and decadal trends (e.g., El Niño/La Niña, Atlantic Multidecadal Oscillation, climate change).

The water column is composed of various physical, chemical and biological features, and only a small number of them are adequately monitored. Features of the water column that are monitored are used as indicators of the water column health and help assess the status of other habitats. These indicators include nutrient concentrations (nitrogen and phosphorus); water quality (dissolved oxygen, temperature, salinity and pH); water clarity (Secchi depth, turbidity, chlorophyll-a and colored dissolved organic matter); and nekton (fish, macroinvertebrates and megafauna).

Seasonal Kendall-Tau Analysis

Indicators must have a minimum of five to ten years, depending on the habitat, of data within the geographic range of the analysis to be included in the analysis. Ten years of data are required for discrete parameters, and five years of data are required for continuous parameters. If there are insufficient years of data, the number of years of data available will be noted and labeled as “insufficient data to conduct analysis”. Further, for the preferred Seasonal Kendall-Tau test, there must be data from at least two months in common across at least two consecutive years within the RCP managed area being analyzed. Values that pass both of these tests will be included in the analysis and be labeled as Use_In_Analysis = TRUE. Any that fail either test will be excluded from the analyses and labeled as Use_In_Analysis = FALSE.

Water Quality - Discrete

The following files were used in the discrete analysis:

  • Combined_WQ_WC_NUT_Chlorophyll_a_corrected_for_pheophytin-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Chlorophyll_a_uncorrected_for_pheophytin-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Colored_dissolved_organic_matter_CDOM-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Dissolved_Oxygen-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Dissolved_Oxygen_Saturation-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_pH-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Salinity-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Secchi_Depth-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Total_Nitrogen-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Total_Phosphorus-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Total_Suspended_Solids_TSS-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Turbidity-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_Water_Temperature-2024-Feb-22.txt

Chlorophyll a, Corrected for Pheophytin - Discrete Water Quality

Chlorophyll-a is monitored as a measure of microalgae growing in the water. Algae are a natural part of coastal and aquatic ecosystems but in excess can cause poor water quality and clarity, and decreased levels of dissolved oxygen.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Chlorophyll a, Corrected for Pheophytin
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Chlorophyll a, Corrected for Pheophytin
ProgramID N_Data YearMin YearMax
5002 530 2001 2023
103 39 2021 2021

Program names:

5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Chlorophyll a, Corrected for Pheophytin
Year N_Total N_I perc_I N_Q perc_Q N_U perc_U
2004 47 2 4.3 1 2.1 34 72.3
2007 28 2 7.1 12 42.9
2008 84 1 1.2
2013 15 1 6.7
2020 63 8 12.7 1 1.6
2021 142 10 7.0 9 6.3 5 3.5
2022 105 12 11.4

Note: 1I - Reported value is greater than or equal to lab method detection limit, but less than quantitation limit 2Q - Sample held beyond the accepted holding time 3U - Compound was analyzed for but not detected

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Chlorophyll a, Uncorrected for Pheophytin - Discrete Water Quality

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Chlorophyll a, Uncorrected for Pheophytin
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Chlorophyll a, Uncorrected for Pheophytin
ProgramID N_Data YearMin YearMax
5002 245 2010 2023
103 139 2004 2021
118 2 2005 2006

Program names:

5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Chlorophyll a, Uncorrected for Pheophytin
Year N_Total N_I perc_I N_Q perc_Q N_U perc_U
2020 64 1 1.6
2021 134 4 3 10 7.5 7 5.2
2022 45 9 20

Note: 1I - Reported value is greater than or equal to lab method detection limit, but less than quantitation limit 2Q - Sample held beyond the accepted holding time 3U - Compound was analyzed for but not detected

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Dissolved Oxygen - Discrete Water Quality

Dissolved Oxygen (DO) is a key indicator of water quality. Oxygen enters surface waters by air-sea gas exchange, by wind action, or as a byproduct of aquatic plant photosynthesis. The actual quantity of DO in aquatic environments is dependent on the above processes as well as water temperature and salinity.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Dissolved Oxygen
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Dissolved Oxygen
ProgramID N_Data YearMin YearMax
103 18455 1982 2021
69 14077 2001 2017
5002 2383 1997 2024
95 189 2013 2018
115 4 1995 1995
118 2 2005 2006

Program names:

103 - EPA STOrage and RETrieval Data Warehouse (STORET)
69 - Fisheries-Independent Monitoring (FIM) Program
5002 - Florida STORET / WIN
95 - Harmful Algal Bloom Marine Observation Network
115 - Environmental Monitoring Assessment Program
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment

There are no qualifying Value Qualifiers for Dissolved Oxygen in Nassau River-St. Johns River Marshes Aquatic Preserve

Dissolved Oxygen Saturation - Discrete Water Quality

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Dissolved Oxygen Saturation
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Dissolved Oxygen Saturation
ProgramID N_Data YearMin YearMax
5002 1099 2000 2024

Program names:

5002 - Florida STORET / WIN

There are no qualifying Value Qualifiers for Dissolved Oxygen Saturation in Nassau River-St. Johns River Marshes Aquatic Preserve

pH - Discrete Water Quality

The pH of water is the measure of how acidic or basic the water body is on a scale of 0-14, with lower readings indicating acidic and higher readings indicating basic, and a pH of 7 being neutral. Florida’s natural waters fall between 6.5 and 8.5 on this scale. A water body’s pH can change due to precipitation, geology, vegetation, water pollution and air pollution.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for pH
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for pH
ProgramID N_Data YearMin YearMax
69 14083 2001 2017
103 8896 1982 2021
5002 2272 1997 2024
95 192 2013 2018
115 3 1995 1995

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program
103 - EPA STOrage and RETrieval Data Warehouse (STORET)
5002 - Florida STORET / WIN
95 - Harmful Algal Bloom Marine Observation Network
115 - Environmental Monitoring Assessment Program

There are no qualifying Value Qualifiers for pH in Nassau River-St. Johns River Marshes Aquatic Preserve

Salinity - Discrete Water Quality

Salinity is a measure of the amount of salt in the water. In estuarine ecosystems, salinity is influenced by precipitation, evaporation, surface-water inputs, and exchange with coastal waters.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Salinity
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Salinity
ProgramID N_Data YearMin YearMax
69 14139 2001 2017
5002 2375 1997 2024
95 212 1980 2018
103 136 2004 2008
118 13 2015 2021
115 4 1995 1995

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program
5002 - Florida STORET / WIN
95 - Harmful Algal Bloom Marine Observation Network
103 - EPA STOrage and RETrieval Data Warehouse (STORET)
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment
115 - Environmental Monitoring Assessment Program

There are no qualifying Value Qualifiers for Salinity in Nassau River-St. Johns River Marshes Aquatic Preserve

Secchi Depth - Discrete Water Quality

Secchi depth is a measure of the transparency or clarity of the water by a device called a Secchi disk. A Secchi disk is a black and white disk that is lowered into the water on a cord. The Secchi depth is the depth at which the disk can no longer be seen. The deeper the Secchi depth, the greater the water clarity.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Secchi Depth
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Secchi Depth
ProgramID N_Data YearMin YearMax
69 14096 2001 2017
5002 435 2000 2024
103 94 1982 2021

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program
5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Secchi Depth
Year N_Total N_S perc_S
2017 813 1 0.1
2020 63 1 1.6
2021 66 1 1.5

Note: 1S - Secchi disk visible to bottom of waterbody

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Total Nitrogen - Discrete Water Quality

Nitrogen and Phosphorous are key nutrients that provide nourishment essential for the growth and maintenance of aquatic plants and animals; however, excess nutrients can cause harmful algal blooms and other water quality concerns. Nutrients enter water bodies several ways, including runoff from rain events and atmospheric deposition from natural and industrial sources.

Total Nitrogen Calculation:

The logic for calculated Total Nitrogen was provided by Kevin O’Donnell and colleagues at FDEP (with the help of Jay Silvanima, Watershed Monitoring Section). The following logic is used, in this order, based on the availability of specific nitrogen components.

  1. TN = TKN + NO3O2;
  2. TN = TKN + NO3 + NO2;
  3. TN = ORGN + NH4 + NO3O2;
  4. TN = ORGN + NH4 + NO2 + NO3;
  5. TN = TKN + NO3;
  6. TN = ORGN + NH4 + NO3;

Additional Information:

  • Rules for use of sample fraction:
    • FDEP report that if both “Total” and “Dissolved” are reported, only “Total” is used. If the total is not reported, they do use dissolved as a best available replacement.
    • An analysis of all SEACAR data shows that 90% of all possible TN calculations can be done using nitrogen components with the same sample fraction, rather than use nitrogen components with mixed total/dissolved sample fractions. In other words, TN can be calculated when TKN and NO3O2 are both total sample fraction, or when both are dissolved sample fraction. This is important, because then the calculated TN value is not based on components with mixed sample fractions.
  • Values inserted into data:
    • ParameterName = “Total Nitrogen”
    • SEACAR_QAQCFlagCode = “1Q”
    • SEACAR_QAQC_Description = “SEACAR Calculated”
      Seasonal Kendall-Tau Trend Analysis
      Discrete Water Quality
      Map showing location of Discrete sampling sites for Total Nitrogen
      Discrete Water Quality
      The bubble size on the above plots reflects the amount of data available at each sampling site
Programs contributing data for Total Nitrogen
ProgramID N_Data YearMin YearMax
5002 803 1997 2023
103 94 1988 2005

Program names:

5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)

There are no qualifying Value Qualifiers for Total Nitrogen in Nassau River-St. Johns River Marshes Aquatic Preserve

Total Phosphorus - Discrete Water Quality

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Total Phosphorus
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Total Phosphorus
ProgramID N_Data YearMin YearMax
5002 1255 1997 2023
103 376 1983 2021

Program names:

5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Total Phosphorus
Year N_Total N_I perc_I N_Q perc_Q N_U perc_U
2002 14 1 7.1
2003 8 1 12.5
2004 86 12 13.9
2005 24 8 33.3
2006 24 14 58.3
2007 75 28 37.3 2 2.7
2008 67 33 49.2 1 1.5
2009 55 36 65.4
2010 55 22 40.0
2011 36 15 41.7 2 5.6
2012 24 14 58.3
2013 37 16 43.2
2014 39 28 71.8 3 7.7
2015 131 92 70.2 10 7.6
2016 36 19 52.8
2017 57 35 61.4 2 3.5
2020 99 17 17.2 1 1.0
2021 204 21 10.3 2 1.0 1 0.5
2022 151 10 6.6 1 0.7
2023 58 11 19.0

Note: 1I - Reported value is greater than or equal to lab method detection limit, but less than quantitation limit 2Q - Sample held beyond the accepted holding time 3U - Compound was analyzed for but not detected

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Total Suspended Solids - Discrete Water Quality

Total Suspended Solids (TSS) are solid particles suspended in water that exceed 2 microns in size and can be trapped by a filter.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Total Suspended Solids
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Total Suspended Solids
ProgramID N_Data YearMin YearMax
5002 726 1997 2023
103 321 1983 2021

Program names:

5002 - Florida STORET / WIN
103 - EPA STOrage and RETrieval Data Warehouse (STORET)

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Total Suspended Solids
Year N_Total N_I perc_I N_Q perc_Q N_U perc_U
2001 7 1 14.3
2006 12 1 8.3 1 8.3
2007 49 3 6.1
2009 27 1 3.7 1 3.7
2010 28 2 7.1
2011 17 1 5.9 2 11.8
2012 12 5 41.7
2013 26 3 11.5
2014 20 3 15.0
2015 69 16 23.2 6 8.7
2016 21 4 19.0
2017 31 2 6.4
2020 56 8 14.3
2021 150 2 1.3
2022 112 6 5.4

Note: 1I - Reported value is greater than or equal to lab method detection limit, but less than quantitation limit 2Q - Sample held beyond the accepted holding time 3U - Compound was analyzed for but not detected

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Turbidity - Discrete Water Quality

Turbidity results from suspended solids in the water, including silts, clays, tannins, industrial wastes, sewage and plankton, which are all factors that contribute to how clouded or murky a water column is. Turbidity is caused by soil erosion, excess nutrients, pollutants, and physical forces such as winds, currents and bottom feeders.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Turbidity
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Turbidity
ProgramID N_Data YearMin YearMax
103 15270 1985 2021
5002 838 1997 2023

Program names:

103 - EPA STOrage and RETrieval Data Warehouse (STORET)
5002 - Florida STORET / WIN

Value Qualifiers

  • N_Total is total amount of data for a given year
  • N_ is the total amount of values flagged with the respective value qualifier in a given year
  • perc_ is the percent of data flagged with the respective value qualifier as a proportion of N_Total
Value Qualifiers for Turbidity
Year N_Total N_I perc_I N_Q perc_Q
2007 53 1 1.9
2011 17 1 5.9 3 17.6
2012 12 2 16.7 2 16.7
2013 26 3 11.5 1 3.9
2014 20 1 5.0 6 30.0
2015 69 1 1.4 3 4.3
2016 21 1 4.8
2021 173 1 0.6

Note: 1I - Reported value is greater than or equal to lab method detection limit, but less than quantitation limit 2Q - Sample held beyond the accepted holding time

Programs containing Value Qualified data:

5002 - Florida STORET / WIN

Water Temperature - Discrete Water Quality

Temperature determines the capacity of water to hold oxygen. Cooler water can hold more dissolved oxygen because water molecules are more tightly packed, making it harder for oxygen to escape. Additionally, as water temperature increases, fish and other aquatic organisms become more active and consume oxygen at a faster rate.

Seasonal Kendall-Tau Trend Analysis
Discrete Water Quality
Map showing location of Discrete sampling sites for Water Temperature
Discrete Water Quality
The bubble size on the above plots reflects the amount of data available at each sampling site

Programs contributing data for Water Temperature
ProgramID N_Data YearMin YearMax
103 19853 1982 2021
69 14142 2001 2017
5002 2401 1997 2024
95 212 2007 2018
115 4 1995 1995

Program names:

103 - EPA STOrage and RETrieval Data Warehouse (STORET)
69 - Fisheries-Independent Monitoring (FIM) Program
5002 - Florida STORET / WIN
95 - Harmful Algal Bloom Marine Observation Network
115 - Environmental Monitoring Assessment Program

There are no qualifying Value Qualifiers for Water Temperature in Nassau River-St. Johns River Marshes Aquatic Preserve

Water Quality - Continuous

The following files were used in the continuous analysis:

  • Combined_WQ_WC_NUT_cont_Dissolved_Oxygen_NE-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_cont_Dissolved_Oxygen_Saturation_NE-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_cont_pH_NE-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_cont_Salinity_NE-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_cont_Turbidity_NE-2024-Feb-22.txt

  • Combined_WQ_WC_NUT_cont_Water_Temperature_NE-2024-Feb-22.txt

Continuous Water Quality
Map showing Continuous Water Quality Monitoring sampling locations within the boundaries of Nassau River-St. Johns River Marshes Aquatic Preserve. Sites marked as Use In Analysis are featured in this report.

Dissolved Oxygen - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - Dissolved Oxygen
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
02231291 120 2 2015 - 2016 8.70 - - - -
NEHM 27804 2 2022 - 2023 5.70 - - - -
NEKD 110958 8 2004 - 2011 6.40 -0.04 6.59 -0.02 0.5607
NELC 95860 7 2005 - 2011 5.60 -0.34 5.93 -0.11 0.0014
NELN 17020 1 2023 - 2023 4.80 - - - -
NENR 31438 3 2009 - 2011 5.80 - - - -
NCB19020038 34476 5 2015 - 2019 6.16 -0.03 6.23 -0.03 0.6108
NCBARD16 7417 2 2015 - 2016 5.08 - - - -
NCBNRCM 35477 5 2015 - 2019 5.79 0.05 5.78 0.01 0.7970

Dissolved Oxygen Saturation - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - Dissolved Oxygen Saturation
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
NEHM 27804 2 2022 - 2023 77.70 - - - -
NEKD 110983 8 2004 - 2011 89.10 0 87.49 -0.04 0.9338
NELC 95868 7 2005 - 2011 77.90 -0.27 78.93 -1.6 0.0111
NELN 17020 1 2023 - 2023 62.50 - - - -
NENR 31438 3 2009 - 2011 73.20 - - - -
NCB19020038 34438 5 2015 - 2019 87.06 -0.16 86.02 -0.6 0.1268
NCBARD16 7417 2 2015 - 2016 74.44 - - - -
NCBNRCM 35240 5 2015 - 2019 82.06 -0.05 81.1 -0.14 0.7970

pH - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - pH
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
NEHM 27812 2 2022 - 2023 7.30 - - - -
NEKD 113471 8 2004 - 2011 7.90 0.19 7.87 0.01 0.0491
NELC 96488 7 2005 - 2011 7.50 0.02 7.51 0 0.9121
NELN 17025 1 2023 - 2023 6.90 - - - -
NENR 31438 3 2009 - 2011 7.10 - - - -
NCB19020038 34405 5 2015 - 2019 7.88 -0.01 7.85 0 1.0000
NCBARD16 6952 2 2015 - 2016 7.66 - - - -
NCBNRCM 35819 5 2015 - 2019 7.72 -0.01 7.69 0 0.9317

Salinity - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - Salinity
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
NEHM 27811 2 2022 - 2023 20.60 - - - -
NEKD 118328 8 2004 - 2011 33.20 0.31 30.29 0.52 0.0006
NELC 100339 7 2005 - 2011 27.90 0.09 25.3 0.53 0.4397
NELN 17025 1 2023 - 2023 5.20 - - - -
NENR 31438 3 2009 - 2011 12.40 - - - -
NCB19020038 34438 5 2015 - 2019 31.75 -0.06 31.07 -0.11 1.0000
NCBARD16 7418 2 2015 - 2016 30.07 - - - -
NCBNRCM 35411 5 2015 - 2019 30.29 -0.12 30.26 -0.39 0.5483

Turbidity - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - Turbidity
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
NEHM 27767 2 2022 - 2023 8.00 - - - -
NEKD 114181 8 2004 - 2011 4.00 0.02 6.06 0.05 0.8697
NELC 96153 7 2005 - 2011 15.00 0.16 15.18 0.64 0.1513
NELN 17016 1 2023 - 2023 9.00 - - - -
NENR 31087 3 2009 - 2011 21.00 - - - -
NCB19020038 31407 5 2015 - 2019 5.77 -0.01 6.79 0.12 0.7876
NCBARD16 7385 2 2015 - 2016 12.89 - - - -
NCBNRCM 34696 5 2015 - 2019 8.64 -0.1 10.09 -0.14 0.6001

Water Temperature - Continuous Water Quality

NEKD

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NELC

Northeast Aquatic Preserves Continuous Water Quality Monitoring (5006)
Continuous Water Quality

NCB19020038

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

NCBNRCM

St. Johns River Water Management District Continuous Water Quality Programs (5061)
Continuous Water Quality

All Stations Combined

Continuous Water Quality
Continuous Water Quality
Seasonal Kendall-Tau Results for All Stations - Water Temperature
Station N_Data N_Years Period of Record Median tau SennIntercept SennSlope p
02231291 127 2 2015 - 2016 14.80 - - - -
NEHM 27857 2 2022 - 2023 23.90 - - - -
NEKD 118328 8 2004 - 2011 22.10 -0.04 21.88 -0.01 0.8057
NELC 100343 7 2005 - 2011 22.70 0.05 22.26 0.04 0.7405
NELN 17025 1 2023 - 2023 27.70 - - - -
NENR 31438 3 2009 - 2011 22.00 - - - -
NCB19020038 34483 5 2015 - 2019 24.78 -0.03 23.32 -0.01 1.0000
NCBARD16 7419 2 2015 - 2016 25.08 - - - -
NCBNRCM 35817 5 2015 - 2019 24.03 0.07 23.26 0.05 0.6681